[imsc] Pull Request: Clarify that tts:backgroundColor does not apply to span where tts:ruby is "none"

palemieux has just submitted a new pull request for https://github.com/w3c/imsc:

== Clarify that tts:backgroundColor does not apply to span where tts:ruby is "none" ==
Closes #571 

See https://github.com/w3c/imsc/pull/573


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Received on Wednesday, 14 July 2021 21:55:30 UTC